I'm genuinely a bit surprised by this comment to be honest. Granted, I've only had mine a month but it's running really nicely on Android 6. Android 5 was a bit chopp mind you. Given its modest specs, it's performing well. That said, I'm no gamer. As a comparison, I also have an iFive Mini 4s and the Lenovo is much smoother.
No I don't think you should buy one for under £100 if your gonna get a bit of kit I'd rather go without and save up enough to get something worthwhile
Any way of "watching" it if its not in stock?